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x86: unregister PIT clocksource when PIT is disabled

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The following scenario might leave PIT as a disfunctional clock source:

    PIT is registered as clocksource
    PM_TIMER is registered as clocksource and enables highres/dyntick mode
    PIT is switched to oneshot mode
    -> now the readout of PIT is bogus, but the user might select PIT
    via the sysfs override, which would break the box as the time
    readout is unusable.

Unregister the PIT clocksource when the PIT clock event device is switched
into shutdown / oneshot mode.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Thomas Gleixner 2008-01-30 13:30:03 +01:00 committed by Ingo Molnar
parent 4713e22ce8
commit 1a0c009ac5
1 changed files with 19 additions and 0 deletions
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19
arch/x86/kernel/i8253.c
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@ -18,6 +18,12 @@
DEFINE_SPINLOCK(i8253_lock);
EXPORT_SYMBOL(i8253_lock);
#ifdef CONFIG_X86_32
static void pit_disable_clocksource(void);
#else
static inline void pit_disable_clocksource(void) { }
#endif
/*
* HPET replaces the PIT, when enabled. So we need to know, which of
* the two timers is used
@ -52,11 +58,13 @@ static void init_pit_timer(enum clock_event_mode mode,
outb_p(0, PIT_CH0);
outb_p(0, PIT_CH0);
}
pit_disable_clocksource();
break;
case CLOCK_EVT_MODE_ONESHOT:
/* One shot setup */
outb_p(0x38, PIT_MODE);
pit_disable_clocksource();
break;
case CLOCK_EVT_MODE_RESUME:
@ -196,6 +204,17 @@ static struct clocksource clocksource_pit = {
.shift = 20,
};
static void pit_disable_clocksource(void)
{
/*
* Use mult to check whether it is registered or not
*/
if (clocksource_pit.mult) {
clocksource_unregister(&clocksource_pit);
clocksource_pit.mult = 0;
}
}
static int __init init_pit_clocksource(void)
{
/*